利用欧米茄（OMEGA）装置上的磁反冲谱仪首次测量绝对中子能谱（特邀报告）。

First measurements of the absolute neutron spectrum using the magnetic recoil spectrometer at OMEGA (invited).

作者信息

Frenje J A, Casey D T, Li C K, Rygg J R, Séguin F H, Petrasso R D, Glebov V Yu, Meyerhofer D D, Sangster T C, Hatchett S, Haan S, Cerjan C, Landen O, Moran M, Song P, Wilson D C, Leeper R J

机构信息

Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

出版信息

Rev Sci Instrum. 2008 Oct;79(10):10E502. doi: 10.1063/1.2956837.

DOI:10.1063/1.2956837

PMID:19044488

Abstract

A neutron spectrometer, called a magnetic recoil spectrometer (MRS), has been built and implemented at the OMEGA laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] for absolute measurements of the neutron spectrum in the range of 6-30 MeV, from which fuel areal density (rhoR), ion temperature (T(i)), and yield (Y(n)) can be determined. The results from the first MRS measurements of the absolute neutron spectrum are presented. In addition, measuring rhoR at the National Ignition Facility (NIF) [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] will be essential for assessing implosion performance during all stages of development from surrogate implosions to cryogenic fizzles to ignited implosions. To accomplish this, we are also developing an MRS for the NIF. As much of the research and development and instrument optimization of the MRS at OMEGA are directly applicable to the MRS at the NIF, a description of the design and characterization of the MRS on the NIF is discussed as well.

摘要

一种名为磁反冲谱仪（MRS）的中子谱仪已在欧米茄激光装置上建成并投入使用[T. R. 博埃利等人，《光学通讯》133, 495 (1997)]，用于绝对测量6 - 30兆电子伏特范围内的中子谱，由此可确定燃料面密度（ρR）、离子温度（T(i)）和产额（Y(n)）。本文展示了首次利用MRS进行绝对中子谱测量的结果。此外，在国家点火装置（NIF）[G. H. 米勒等人，《核聚变》44, S228 (2004)]上测量ρR对于评估从替代内爆到低温失败再到点火内爆等所有发展阶段的内爆性能至关重要。为实现这一目标，我们也正在为NIF研发一台MRS。由于欧米茄激光装置上MRS的许多研发和仪器优化工作可直接应用于NIF上的MRS，本文也讨论了NIF上MRS的设计与特性描述。